Gas generator for air bag and air bag system

A gas generator for an air bag, comprising:

• a housing having at least one gas discharge port;
• igniting means that is actuated when an impact sensor detects an impact;
• solid bodies of gas generating agent that are ignited by the igniting means and burned to generate a combustion gas;
• and
• coolant/filter means for cooling the combustion gas and scavenging combustion residues, said igniting means, said gas generating agent and said filter means being accommodated in said housing, wherein
• a ratio (A/At) of a total surface area A of said solid bodies of gas generating agent to a total opening area At of said at least one gas discharge port is limited to be larger than 300, and
• wherein a value of a pressure loss of said coolant/filter means is lower than the value of a pressure loss of the gas discharge ports formed in the housing.

An air bag system comprising:

• a gas generator for an air bag, wherein said gas generator includes,
• a housing having at least one gas discharge port;
• igniting means that is actuated when an impact sensor detects an impact;
• solid bodies of gas generating agent that are ignited by the igniting means and burned to generate a combustion gas;
• and
• coolant/filter means for cooling the combustion gas and scavenging combustion residues, said igniting means, said gas generating agent and said filter means being accommodated in said housing, wherein
• a ratio (A/At) of a total surface area A of said solid bodies of gas generating agent to a total opening area At of said at least one gas discharge port is limited to be larger than 300, and
• wherein a difference between the maximum pressures at 85° C. and 20° C. and a difference between the maximum pressures at 20° C. and −40° C. obtained in tank pressure tests using a tank, whose capacity is 60 l, are each 25% or less of the maximum output pressure in the tank pressure test at 20° C.;
• an impact sensor that actuates the gas generator upon detection of an impact;
• an air bag which is inflated by a gas generated by said gas generator and introduced into the air bag;
• and
• a module case that stores said air bag.